Furnace-door.



"0. AUBE'.

FURNAGE DOOR.

APPLICATION FILED APR. 8, 1908.

Patented June 22, 1909.v

' Inventor. Www M.

ocTAvE AUBE, or MONTREAL, QUEBEC, CANADA.

FURNACE-DOOR.

Specification of Letters Patent.

Patented June 22, 1909.

lApplication led April 8, 1908. Seri N0. 425,898.

To all 'whom it may concern: I

Be it known that 1, OoTAvE AUBE, a suby iiect of the King of Great Britain, residing at specification and illustrated in`the accompanying drawings that form part of the same.

Theinvention consists essentially in the novel arrangement and construction of parts whereby a particular form of box is attached to the door for heating air passing through Y suitable openings in said 4door into the lire box.

rille objects of the invention are to insure proper combustion of the fuel and thus achieve great economy in the consumption thereof, and to provide a simple method of consuming the smoke, thereby eliminating that nuisance.

ln the drawings, Figure 1 is a sectional perspective view ofthe furnace door. Fig. 2 is a perspective detail of the box from the rear partially broken away to disclose the interior'. Fig. 3 is a front elevation of the door partially vbroken away to disclose the interior of the box.

Lilie numerals of reference indicate correspending parts in each ligure.

Referring to the drawings, 1 is the door frame suitably secured to the furnace Wall 2 and'sunounding the fuel ingressI opening.

3 is the door hinged at one side thereof to the frame 1 and having va central opening 4 therethrough and a plurality of slots 5 at the edge ol its inwardly turned side, said slots forming openings into said fuel ingressopening when the door isinf-itsV closed position.

6 is a fla door hinged at its up r side to thefront of) the door and closing tilie central opening 4.

7 is a box formed of suitable material and rigidly secured to the door through the lugs 8 'and 9 projecting from said box and said door 'res ctively, the said box 7 converging s' tly toward the rear side. 10, said rear side having a central o eniiig 11 therethrough and a row of pe .orations 12 therethrough around said opening.

13 areposts rigidly secured to the rear side and projecting forwardly into said box.

14 is a plate having the oblique slots 15 and a plurality of holes 16 therethrough, said plate 14 being supported by the said posts 13 intermediate of the length of said posts.

17 is a plate having oblique slots 18 running in a contrary .direction to the slots and a plurality o f holes 19. The said plate v1.7 is supported at the forward ends of the posts 13 and firmly secured thereon by the nuts 20. V

The plates 14 and 17 are of smaller dirnensions than the inside of the box 7 consequently the air flowing through the box may pass around the edges of said plates through to lthe inside of said box and conseq-uently to the inside of the fire box.

21 is a plate serving .as a damper and adapted to close the central opening 11 in the rear side of the Lbox, said plate 21 having a central hole therethrough. 22 is a pin threaded at one end and at the other end inserted: in the said central hole in the plate 21 and turning freely in said hole, being secured therein to the outer side of the shoulder 23 by the nut- 24. The posts 13 also extendgthrough suitable orifices and slots in the plate 21, the -said plate sliding freely on said posts. The in 22 extends through suitable'holes in t e lplates 14 'and 17 and slides freely therein,`-`a nut 25 being placed on the oiiter end of said threaded pin to the outside ofthe plate 17 so that by turning on the said nut 25, the plate 21 is drawn forwardly on.l the posts 13 or forced rear- `Wardly thereon to close the opening 11, as

the case may be.

26 is a steam ipe connected with -a suitable steam supp yv and projecting Jthrough into the lire box above the box 7 In the operation of this invention, the box 7 forms a hot air chamber, the air flowing in through the o ening or openings in the door and being iverted in its straight course firstly, by the plate 17;- On striking said plate or partsof it, a large percentage of the said air receives its 'first heatmg finding ingress` after the iirst obstruction throughv the oblique slots 181' and other holes and around between the edges of said late and the side of the box. The further ow of the .air is again obstructed by the plate 14 and las the slots 15 are substantially at right angles to the s101118, there cannot be a clear iiow of the air through said plates, the diflferent direction of the slots'offering a requisite obstruction. The .air becomes further heated before passing the plate 14 and then reaches the inside of the box, flowing through the `row of perforations and through the opening between the edge of the plate 21 and the rear side 10. The size of this o ening between said plate and said rear si e .is regulated by the turning of the nut on the threaded pin 22, land it will depend largely on the size of the furnace andre box there to as to what opening will be leftbetween said'plate and said rear side. The steam is turned on through the steam pipe and coacts with the flow' of air in promoting the combustion of the fuel in the furnace, thus doing away with the smoke nuisance. The' heating of the air before it reaches the fire boxl will of course develop-a gas highly combustible in mixing with the other gases from the fuel and combined with the steam, effect improved combustion.

The side wall of the box rigidly secured to the front plate of the door at .the opening end of said door slopes sufficiently to clear the front wall of the furnace, and further the depression in the top of the box, clearly shown in Fig. 2, permits the free opening of the said door notwithstanding the steam pipe extending into the fire box, as the said depression widens considerably toward the extreme inner end of said box. Y

The arrangement of the plate, which is arranged immediately in front of the back plate in the interiorof the box, may be varied according to the existing conditions under which the invention is used, for the object of said plate is to vary the opening into the fire box over the edges thereof and through the said opening in said back plate, therefore in most eases when its position has been determined for theparticular furnace to which it is to be applied, it will be securely locked in that position and no doubt rigidly secured to such position.

What l claim as my invention is:

l. A furnace door, comprising a front side having suitable o enings therethrough, a

-rear side having a arge'eentral opening and a circular row of small holes surrounding said opening and converging wall joining said front and rear sides and fofmlng therewith a box, a plurality of plates having many holes therethrough and arrangedwithin said box between the front and rear sides and a solid plate of greater diameter than said central opening, overlapping the rear side for part of the distance between the edge of said central o eningand the surrounding row of holes an held adjacent to said rear side.

2. ln a furnace door, the combinatioi. with a'iire box having a fuel ingress opening, of a door having an opening therethrough, means for closing saidv opening, a box rigid with said door and converging slightly to its rear side, said rear side having a central opening therethrough, posts rigidly secured to said rear side and extending forwardly, a pluralitybf plates sup orted on said posts and havlng oblique s ots therethrough in staggered arrangement res ectively, a plate closing said o ening in tffe rear side and sliding on sai posts and an adjusting pin extending from said rear plate through the aforesaid plates.'

, 3. ln a devlce of the class described, in combination, a fire box having a suitable fuelingress opening thereinto, a door frame 'secured around said fuel opening, a door hinged to said door frame and having a plurality of slots around the edge thereof formx ing openings and a central opening therethrough, a flap door closing said central opening, a box rigidly secured te said door and extending rearwardly' therefrom -converging to its rear side, said rear side having a central opening therethrough and a row of perforations therearound, posts 'rlfridly secured to said rear side and extend wardly, plates having holes and oblique slots therethrough supported on said posts intermediately of the depth of said box, a plate closing said central. opening in the rear side and sliding freely on said posts, an adjusting pin turningl freely in said plates and having a threaded end extending through ing for# said pilates and adjusted by a suitable nut,

and a steam inlet ipe extending atene end into the fire box a ove said door and at the other end connected to a suitable steam Surrlrbigned at the city and district of Montreal, in the Province of Quebec, in the Dominion of Canada, this 14th day of March, 1908.

OC'lAVE AUB. Witnesses Gr. H. Tnnsrnnnv, HARRY Davis. 

